1. Liver Unit; Division of Gastroenterology and Hepatology; Hospital Universitario Central de Asturias; Oviedo Asturias Spain
2. Virology Unit; Department of Microbiology; Hospital Universitario Central de Asturias; Oviedo Asturias Spain
3. Department of Pathology; Hospital Universitario Central de Asturias; Oviedo Asturias Spain